<html>
  <head>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
    <title>delete_arcs</title>
  </head>
  <body bgcolor="#FFFFFF">
    <center>Scilab function</center>
    <div align="right">Last update : September 1996</div>
    <p>
      <b>delete_arcs</b> -  deletes all the arcs or edges between a set of nodes</p>
    <h3>
      <font color="blue">Calling Sequence</font>
    </h3>
    <dl>
      <dd>
        <tt>g1 = delete_arcs(ij,g)  </tt>
      </dd>
    </dl>
    <h3>
      <font color="blue">Parameters</font>
    </h3>
    <ul>
      <li>
        <tt>
          <b>ij</b>
        </tt>: matrix of integers (number of nodes)</li>
      <li>
        <tt>
          <b>g</b>
        </tt>: graph list</li>
      <li>
        <tt>
          <b>g1</b>
        </tt>: graph list of the new graph without the arcs or edges defined by ij</li>
    </ul>
    <h3>
      <font color="blue">Description</font>
    </h3>
    <p>
    If <tt>
        <b>g</b>
      </tt> is a directed graph,
    <tt>
        <b>delete_arcs</b>
      </tt> returns the graph <tt>
        <b>g1</b>
      </tt> with the arcs defined 
    by matrix <tt>
        <b>ij</b>
      </tt> being deleted.
    <tt>
        <b>ij</b>
      </tt> must be a n x 2 matrix of node numbers: the n arcs to be
    deleted are defined by couples of nodes (<tt>
        <b>ij(i,1)</b>
      </tt>, <tt>
        <b>ij(i,2)</b>
      </tt>).</p>
    <p>
    If <tt>
        <b>g</b>
      </tt> is an undirected graph, the edges corresponding to matrix <tt>
        <b>ij</b>
      </tt>
    are deleted.</p>
    <h3>
      <font color="blue">Examples</font>
    </h3>
    <pre>

ta=[1 1 2 2 2 3 4 5 5 7 8 8 9 10 10 10 10 10 11 12 13 13 13 14 15 16 16 17 17];
he=[2 10 3 5 7 4 2 4 6 8 6 9 7 7 11 13 13 15 12 13 9 10 14 11 16 1 17 14 15];
g=make_graph('foo',1,17,ta,he);
g('node_x')=[283 163 63 57 164 164 273 271 339 384 504 513 439 623 631 757 642];
g('node_y')=[59 133 223 318 227 319 221 324 432 141 209 319 428 443 187 151 301];
show_graph(g);
ij=[13 10;8 6;5 4;4 2];
gt=delete_arcs(ij,g);
show_graph(gt,'new');
g('directed')=0;
gt=delete_arcs(ij,g);
show_graph(gt,'new');
 
  </pre>
    <h3>
      <font color="blue">See Also</font>
    </h3>
    <p>
      <a href="add_edge.htm">
        <tt>
          <b>add_edge</b>
        </tt>
      </a>,&nbsp;&nbsp;<a href="add_node.htm">
        <tt>
          <b>add_node</b>
        </tt>
      </a>,&nbsp;&nbsp;<a href="delete_nodes.htm">
        <tt>
          <b>delete_nodes</b>
        </tt>
      </a>,&nbsp;&nbsp;</p>
  </body>
</html>
